---
title: "Fronius Primo 3.5-1 vs SOFAR 3.6KTLM-G3 - Inverter Comparison | ComparePV"
description: "Compare Fronius Primo 3.5-1 vs SOFAR 3.6KTLM-G3 side by side: what actually differs, efficiency, MPP trackers, battery input and the full specification."
source: "https://comparepv.com/compare-inverters/fronius-international-fronius-primo-3-5-1/sofar-solar-sofar-3-6ktlm-g3"
updated: 2026-01-16
---

# Fronius Primo 3.5-1 vs SOFAR 3.6KTLM-G3

SOFAR 3.6KTLM-G3 leads on the differences that matter

The largest is european efficiency: 0.7 pp more efficient. 5 of 20 comparable parameters are identical, with 12 more left out because at least one datasheet does not publish them.


## The two inverters


| Attribute | A | B |
| --- | --- | --- |
| Inverter | [Fronius Primo 3.5-1](https://comparepv.com/inverter/fronius-international-fronius-primo-3-5-1) | [SOFAR 3.6KTLM-G3](https://comparepv.com/inverter/sofar-solar-sofar-3-6ktlm-g3) |
| Manufacturer | Fronius International | Sofar Solar |
| Rated AC power | 3.5 kW | 3.6 kW |
| Type | Grid-tie | Grid-tie |


## Where they differ

Ranked by how much the difference matters, not by datasheet order.


| Parameter | Fronius Primo 3.5-1 | SOFAR 3.6KTLM-G3 | Difference |
| --- | --- | --- | --- |
| European efficiency | 96.8 % | 97.5 % | +0.7 pp for SOFAR 3.6KTLM-G3 |
| Max DC voltage | 1000 V | 600 V | 400 V apart |
| Max input current per tracker | 18.0 A | 15.0 A | +3.0 A for Fronius Primo 3.5-1 |
| Rated AC power | 3.50 kW | 3.60 kW | 0.10 kW apart |
| Weight | 21.5 kg | 10.0 kg | -11.5 kg for SOFAR 3.6KTLM-G3 |
| Weight per kW | 6.1 kg/kW | 2.8 kg/kW | -3.4 kg/kW for SOFAR 3.6KTLM-G3 |
| Max AC power | 3.50 kW | 3.68 kW | 0.18 kW apart |
| Max efficiency | 98.0 % | 98.4 % | +0.4 pp for SOFAR 3.6KTLM-G3 |
| Max operating temperature | 55 °C | 60 °C | +5 °C for SOFAR 3.6KTLM-G3 |
| MPPT voltage range | 80-800 V | 80-550 V | 80-800 V vs 80-550 V |
| Max AC current | 15.2 A | 16.0 A | 0.8 A apart |
| Start voltage | 80 V | 90 V | -10 V for Fronius Primo 3.5-1 |
| Strings per tracker | 2 | 1 | 1 string apart |
| Dimensions | 645x431x204 mm | 344x349x164 mm | 645x431x204 mm vs 344x349x164 mm |
| Cooling | forced-air | natural | forced-air vs natural |


## Every compared parameter


| Parameter | Fronius Primo 3.5-1 | SOFAR 3.6KTLM-G3 |
| --- | --- | --- |
| Rated AC power | 3.50 kW | 3.60 kW |
| Max AC power | 3.50 kW | 3.68 kW |
| Grid connection | Single-phase | Single-phase |
| Nominal AC voltage | 230 V | 230 V |
| Max AC current | 15.2 A | 16.0 A |
| Max PV power | 5.30 kW | - |
| DC/AC ratio | 1.51 | - |
| Max DC voltage | 1000 V | 600 V |
| MPPT voltage range | 80-800 V | 80-550 V |
| Start voltage | 80 V | 90 V |
| MPP trackers | 2 | 2 |
| Strings per tracker | 2 | 1 |
| Max input current per tracker | 18.0 A | 15.0 A |
| European efficiency | 96.8 % | 97.5 % |
| Max efficiency | 98.0 % | 98.4 % |
| CEC efficiency | - | - |
| Battery input | - | - |
| Battery voltage | - | - |
| Max charge current | - | - |
| Backup power | - | - |
| Weight | 21.5 kg | 10.0 kg |
| Weight per kW | 6.1 kg/kW | 2.8 kg/kW |
| Dimensions | 645x431x204 mm | 344x349x164 mm |
| Ingress protection | IP65 | IP65 |
| Cooling | forced-air | natural |
| Noise | - | - |
| Max operating temperature | 55 °C | 60 °C |
| Wi-Fi | Yes | - |
| Ethernet | Yes | - |
| Arc fault protection | - | - |
| Integrated DC switch | Yes | Yes |
| Warranty | - | - |


## Related comparisons

- [Fronius Primo 3.5-1 vs SolarEdge SE3500H (HD‑Wave, single phase)](https://comparepv.com/compare-inverters/fronius-international-fronius-primo-3-5-1/solaredge-solaredge-se3500h-hd-wave-single-phase) - 10 differences, the largest is european efficiency
- [Fronius Primo 3.5-1 vs Ginlong Solis S6-GR1P3.6K-S](https://comparepv.com/compare-inverters/fronius-international-fronius-primo-3-5-1/ginlong-solis-s6-gr1p3-6k-s) - 17 differences, the largest is max dc voltage
- [Fronius Primo 3.5-1 vs Growatt MIN 3600TL-X](https://comparepv.com/compare-inverters/fronius-international-fronius-primo-3-5-1/growatt-min-3600tl-x) - 18 differences, the largest is max dc voltage
- [SOFAR 3.6KTLM-G3 vs Ginlong Solis S6-GR1P3.6K-M](https://comparepv.com/compare-inverters/sofar-solar-sofar-3-6ktlm-g3/ginlong-solis-s6-gr1p3-6k-m) - 13 differences, the largest is european efficiency
- [SOFAR 3.6KTLM-G3 vs Ginlong Solis S6-GR1P3.6K](https://comparepv.com/compare-inverters/sofar-solar-sofar-3-6ktlm-g3/ginlong-solis-s6-gr1p3-6k) - 10 differences, the largest is european efficiency


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Source: https://comparepv.com/compare-inverters/fronius-international-fronius-primo-3-5-1/sofar-solar-sofar-3-6ktlm-g3

Not in this file, on the page: a written summary generated on request.